If you were to take a hard covered book and to roll it on top of three unknown objects and you felt the book rolling smoothly, not ever bumping up and down or changing the distance of it and the table, you would expect the three solids under the book were spheres. In fact the three solids don't nece...By: ollie242
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from Instructables: exploring - technology - robots http://www.instructables.com/id/Solids-of-a-constant-width-with-AutoCAD/
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